source: opengl-game/vulkan-game.cpp@ f94eea9

#include "vulkan-game.hpp"

#include <iostream>
#include <set>

#include "consts.hpp"
#include "logger.hpp"

#include "vulkan-utils.hpp"

using namespace std;

VulkanGame::VulkanGame() {
   gui = nullptr;
   window = nullptr;
}

VulkanGame::~VulkanGame() {
}

void VulkanGame::run(int width, int height, unsigned char guiFlags) {
   cout << "DEBUGGING IS " << (ENABLE_VALIDATION_LAYERS ? "ON" : "OFF") << endl;

   cout << "Vulkan Game" << endl;

   // This gets the runtime version, use SDL_VERSION() for the comppile-time version
   // TODO: Create a game-gui function to get the gui version and retrieve it that way
   SDL_GetVersion(&sdlVersion);

   // TODO: Refactor the logger api to be more flexible,
   // esp. since gl_log() and gl_log_err() have issues printing anything besides stirngs
   restart_gl_log();
   gl_log("starting SDL\n%s.%s.%s",
      to_string(sdlVersion.major).c_str(),
      to_string(sdlVersion.minor).c_str(),
      to_string(sdlVersion.patch).c_str());

   open_log();
   get_log() << "starting SDL" << endl;
   get_log() <<
      (int)sdlVersion.major << "." <<
      (int)sdlVersion.minor << "." <<
      (int)sdlVersion.patch << endl;

   if (initWindow(width, height, guiFlags) == RTWO_ERROR) {
      return;
   }

   initVulkan();
   mainLoop();
   cleanup();

   close_log();
}

// TODO: Make some more initi functions, or call this initUI if the
// amount of things initialized here keeps growing
bool VulkanGame::initWindow(int width, int height, unsigned char guiFlags) {
   // TODO: Put all fonts, textures, and images in the assets folder
   gui = new GameGui_SDL();

   if (gui->init() == RTWO_ERROR) {
      // TODO: Also print these sorts of errors to the log
      cout << "UI library could not be initialized!" << endl;
      cout << gui->getError() << endl;
      return RTWO_ERROR;
   }

   window = (SDL_Window*) gui->createWindow("Vulkan Game", width, height, guiFlags & GUI_FLAGS_WINDOW_FULLSCREEN);
   if (window == nullptr) {
      cout << "Window could not be created!" << endl;
      cout << gui->getError() << endl;
      return RTWO_ERROR;
   }

   cout << "Target window size: (" << width << ", " << height << ")" << endl;
   cout << "Actual window size: (" << gui->getWindowWidth() << ", " << gui->getWindowHeight() << ")" << endl;

   renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
   if (renderer == nullptr) {
      cout << "Renderer could not be created!" << endl;
      cout << gui->getError() << endl;
      return RTWO_ERROR;
   }

   return RTWO_SUCCESS;
}

void VulkanGame::initVulkan() {
   const vector<const char*> validationLayers = {
      "VK_LAYER_KHRONOS_validation"
   };
   const vector<const char*> deviceExtensions = {
      VK_KHR_SWAPCHAIN_EXTENSION_NAME
   };

   createVulkanInstance(validationLayers);
   setupDebugMessenger();
   createVulkanSurface();
   pickPhysicalDevice(deviceExtensions);
   createLogicalDevice(validationLayers, deviceExtensions);
   createSwapChain();
   createImageViews();
}

void VulkanGame::mainLoop() {
   UIEvent e;
   bool quit = false;

   SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);

   while (!quit) {
      gui->processEvents();

      while (gui->pollEvent(&e)) {
         switch(e.type) {
            case UI_EVENT_QUIT:
               cout << "Quit event detected" << endl;
               quit = true;
               break;
            case UI_EVENT_WINDOW:
               cout << "Window event detected" << endl;
               // Currently unused
               break;
            case UI_EVENT_KEY:
               if (e.key.keycode == SDL_SCANCODE_ESCAPE) {
                  quit = true;
               } else {
                  cout << "Key event detected" << endl;
               }
               break;
            case UI_EVENT_MOUSEBUTTONDOWN:
               cout << "Mouse button down event detected" << endl;
               break;
            case UI_EVENT_MOUSEBUTTONUP:
               cout << "Mouse button up event detected" << endl;
               break;
            case UI_EVENT_MOUSEMOTION:
               break;
            default:
               cout << "Unhandled UI event: " << e.type << endl;
         }
      }

      renderUI();
      renderScene();
   }

   vkDeviceWaitIdle(device);
}

void VulkanGame::renderUI() {
   SDL_RenderClear(renderer);
   SDL_RenderPresent(renderer);
}

void VulkanGame::renderScene() {
}

void VulkanGame::cleanup() {
   cleanupSwapChain();

   vkDestroyDevice(device, nullptr);
   vkDestroySurfaceKHR(instance, surface, nullptr);

   if (ENABLE_VALIDATION_LAYERS) {
      VulkanUtils::destroyDebugUtilsMessengerEXT(instance, debugMessenger, nullptr);
   }

   vkDestroyInstance(instance, nullptr);

   SDL_DestroyRenderer(renderer);
   renderer = nullptr;

   gui->destroyWindow();
   gui->shutdown();
   delete gui;
}

void VulkanGame::createVulkanInstance(const vector<const char*> &validationLayers) {
   if (ENABLE_VALIDATION_LAYERS && !VulkanUtils::checkValidationLayerSupport(validationLayers)) {
      throw runtime_error("validation layers requested, but not available!");
   }

   VkApplicationInfo appInfo = {};
   appInfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
   appInfo.pApplicationName = "Vulkan Game";
   appInfo.applicationVersion = VK_MAKE_VERSION(1, 0, 0);
   appInfo.pEngineName = "No Engine";
   appInfo.engineVersion = VK_MAKE_VERSION(1, 0, 0);
   appInfo.apiVersion = VK_API_VERSION_1_0;

   VkInstanceCreateInfo createInfo = {};
   createInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
   createInfo.pApplicationInfo = &appInfo;

   vector<const char*> extensions = gui->getRequiredExtensions();
   if (ENABLE_VALIDATION_LAYERS) {
      extensions.push_back(VK_EXT_DEBUG_UTILS_EXTENSION_NAME);
   }

   createInfo.enabledExtensionCount = static_cast<uint32_t>(extensions.size());
   createInfo.ppEnabledExtensionNames = extensions.data();

   cout << endl << "Extensions:" << endl;
   for (const char* extensionName : extensions) {
      cout << extensionName << endl;
   }
   cout << endl;

   VkDebugUtilsMessengerCreateInfoEXT debugCreateInfo;
   if (ENABLE_VALIDATION_LAYERS) {
      createInfo.enabledLayerCount = static_cast<uint32_t>(validationLayers.size());
      createInfo.ppEnabledLayerNames = validationLayers.data();

      populateDebugMessengerCreateInfo(debugCreateInfo);
      createInfo.pNext = &debugCreateInfo;
   } else {
      createInfo.enabledLayerCount = 0;

      createInfo.pNext = nullptr;
   }

   if (vkCreateInstance(&createInfo, nullptr, &instance) != VK_SUCCESS) {
      throw runtime_error("failed to create instance!");
   }
}

void VulkanGame::setupDebugMessenger() {
   if (!ENABLE_VALIDATION_LAYERS) return;

   VkDebugUtilsMessengerCreateInfoEXT createInfo;
   populateDebugMessengerCreateInfo(createInfo);

   if (VulkanUtils::createDebugUtilsMessengerEXT(instance, &createInfo, nullptr, &debugMessenger) != VK_SUCCESS) {
      throw runtime_error("failed to set up debug messenger!");
   }
}

void VulkanGame::populateDebugMessengerCreateInfo(VkDebugUtilsMessengerCreateInfoEXT& createInfo) {
   createInfo = {};
   createInfo.sType = VK_STRUCTURE_TYPE_DEBUG_UTILS_MESSENGER_CREATE_INFO_EXT;
   createInfo.messageSeverity = VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT;
   createInfo.messageType = VK_DEBUG_UTILS_MESSAGE_TYPE_GENERAL_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_TYPE_VALIDATION_BIT_EXT | VK_DEBUG_UTILS_MESSAGE_TYPE_PERFORMANCE_BIT_EXT;
   createInfo.pfnUserCallback = debugCallback;
}

VKAPI_ATTR VkBool32 VKAPI_CALL VulkanGame::debugCallback(
      VkDebugUtilsMessageSeverityFlagBitsEXT messageSeverity,
      VkDebugUtilsMessageTypeFlagsEXT messageType,
      const VkDebugUtilsMessengerCallbackDataEXT* pCallbackData,
      void* pUserData) {
   cerr << "validation layer: " << pCallbackData->pMessage << endl;

   return VK_FALSE;
}

void VulkanGame::createVulkanSurface() {
   if (gui->createVulkanSurface(instance, &surface) == RTWO_ERROR) {
      throw runtime_error("failed to create window surface!");
   }
}

void VulkanGame::pickPhysicalDevice(const vector<const char*>& deviceExtensions) {
   uint32_t deviceCount = 0;
   vkEnumeratePhysicalDevices(instance, &deviceCount, nullptr);

   if (deviceCount == 0) {
      throw runtime_error("failed to find GPUs with Vulkan support!");
   }

   vector<VkPhysicalDevice> devices(deviceCount);
   vkEnumeratePhysicalDevices(instance, &deviceCount, devices.data());

   cout << endl << "Graphics cards:" << endl;
   for (const VkPhysicalDevice& device : devices) {
      if (isDeviceSuitable(device, deviceExtensions)) {
         physicalDevice = device;
         break;
      }
   }
   cout << endl;

   if (physicalDevice == VK_NULL_HANDLE) {
      throw runtime_error("failed to find a suitable GPU!");
   }
}

bool VulkanGame::isDeviceSuitable(VkPhysicalDevice device, const vector<const char*>& deviceExtensions) {
   VkPhysicalDeviceProperties deviceProperties;
   vkGetPhysicalDeviceProperties(device, &deviceProperties);

   cout << "Device: " << deviceProperties.deviceName << endl;

   QueueFamilyIndices indices = VulkanUtils::findQueueFamilies(device, surface);
   bool extensionsSupported = VulkanUtils::checkDeviceExtensionSupport(device, deviceExtensions);
   bool swapChainAdequate = false;

   if (extensionsSupported) {
      SwapChainSupportDetails swapChainSupport = VulkanUtils::querySwapChainSupport(device, surface);
      swapChainAdequate = !swapChainSupport.formats.empty() && !swapChainSupport.presentModes.empty();
   }

   VkPhysicalDeviceFeatures supportedFeatures;
   vkGetPhysicalDeviceFeatures(device, &supportedFeatures);

   return indices.isComplete() && extensionsSupported && swapChainAdequate && supportedFeatures.samplerAnisotropy;
}

void VulkanGame::createLogicalDevice(
      const vector<const char*> validationLayers,
      const vector<const char*>& deviceExtensions) {
   QueueFamilyIndices indices = VulkanUtils::findQueueFamilies(physicalDevice, surface);

   vector<VkDeviceQueueCreateInfo> queueCreateInfos;
   set<uint32_t> uniqueQueueFamilies = { indices.graphicsFamily.value(), indices.presentFamily.value() };

   float queuePriority = 1.0f;
   for (uint32_t queueFamily : uniqueQueueFamilies) {
      VkDeviceQueueCreateInfo queueCreateInfo = {};
      queueCreateInfo.sType = VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO;
      queueCreateInfo.queueFamilyIndex = queueFamily;
      queueCreateInfo.queueCount = 1;
      queueCreateInfo.pQueuePriorities = &queuePriority;

      queueCreateInfos.push_back(queueCreateInfo);
   }

   VkPhysicalDeviceFeatures deviceFeatures = {};
   deviceFeatures.samplerAnisotropy = VK_TRUE;

   VkDeviceCreateInfo createInfo = {};
   createInfo.sType = VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO;
   createInfo.queueCreateInfoCount = static_cast<uint32_t>(queueCreateInfos.size());
   createInfo.pQueueCreateInfos = queueCreateInfos.data();

   createInfo.pEnabledFeatures = &deviceFeatures;

   createInfo.enabledExtensionCount = static_cast<uint32_t>(deviceExtensions.size());
   createInfo.ppEnabledExtensionNames = deviceExtensions.data();

   // These fields are ignored  by up-to-date Vulkan implementations,
   // but it's a good idea to set them for backwards compatibility
   if (ENABLE_VALIDATION_LAYERS) {
      createInfo.enabledLayerCount = static_cast<uint32_t>(validationLayers.size());
      createInfo.ppEnabledLayerNames = validationLayers.data();
   } else {
      createInfo.enabledLayerCount = 0;
   }

   if (vkCreateDevice(physicalDevice, &createInfo, nullptr, &device) != VK_SUCCESS) {
      throw runtime_error("failed to create logical device!");
   }

   vkGetDeviceQueue(device, indices.graphicsFamily.value(), 0, &graphicsQueue);
   vkGetDeviceQueue(device, indices.presentFamily.value(), 0, &presentQueue);
}

void VulkanGame::createSwapChain() {
   SwapChainSupportDetails swapChainSupport = VulkanUtils::querySwapChainSupport(physicalDevice, surface);

   VkSurfaceFormatKHR surfaceFormat = VulkanUtils::chooseSwapSurfaceFormat(swapChainSupport.formats);
   VkPresentModeKHR presentMode = VulkanUtils::chooseSwapPresentMode(swapChainSupport.presentModes);
   VkExtent2D extent = VulkanUtils::chooseSwapExtent(swapChainSupport.capabilities, gui->getWindowWidth(), gui->getWindowHeight());

   uint32_t imageCount = swapChainSupport.capabilities.minImageCount + 1;
   if (swapChainSupport.capabilities.maxImageCount > 0 && imageCount > swapChainSupport.capabilities.maxImageCount) {
      imageCount = swapChainSupport.capabilities.maxImageCount;
   }

   VkSwapchainCreateInfoKHR createInfo = {};
   createInfo.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
   createInfo.surface = surface;
   createInfo.minImageCount = imageCount;
   createInfo.imageFormat = surfaceFormat.format;
   createInfo.imageColorSpace = surfaceFormat.colorSpace;
   createInfo.imageExtent = extent;
   createInfo.imageArrayLayers = 1;
   createInfo.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;

   QueueFamilyIndices indices = VulkanUtils::findQueueFamilies(physicalDevice, surface);
   uint32_t queueFamilyIndices[] = { indices.graphicsFamily.value(), indices.presentFamily.value() };

   if (indices.graphicsFamily != indices.presentFamily) {
      createInfo.imageSharingMode = VK_SHARING_MODE_CONCURRENT;
      createInfo.queueFamilyIndexCount = 2;
      createInfo.pQueueFamilyIndices = queueFamilyIndices;
   } else {
      createInfo.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;
      createInfo.queueFamilyIndexCount = 0;
      createInfo.pQueueFamilyIndices = nullptr;
   }

   createInfo.preTransform = swapChainSupport.capabilities.currentTransform;
   createInfo.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
   createInfo.presentMode = presentMode;
   createInfo.clipped = VK_TRUE;
   createInfo.oldSwapchain = VK_NULL_HANDLE;

   if (vkCreateSwapchainKHR(device, &createInfo, nullptr, &swapChain) != VK_SUCCESS) {
      throw runtime_error("failed to create swap chain!");
   }

   vkGetSwapchainImagesKHR(device, swapChain, &imageCount, nullptr);
   swapChainImages.resize(imageCount);
   vkGetSwapchainImagesKHR(device, swapChain, &imageCount, swapChainImages.data());

   swapChainImageFormat = surfaceFormat.format;
   swapChainExtent = extent;
}

void VulkanGame::createImageViews() {
   swapChainImageViews.resize(swapChainImages.size());

   for (size_t i = 0; i < swapChainImages.size(); i++) {
      swapChainImageViews[i] = VulkanUtils::createImageView(device, swapChainImages[i], swapChainImageFormat,
         VK_IMAGE_ASPECT_COLOR_BIT);
   }
}

void VulkanGame::cleanupSwapChain() {
   for (auto imageView : swapChainImageViews) {
      vkDestroyImageView(device, imageView, nullptr);
   }

   vkDestroySwapchainKHR(device, swapChain, nullptr);
}